Broken SU(4) symmetry in a Kondo-correlated carbon nanotube
Broken SU(4) symmetry in a Kondo-correlated carbon nanotube
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近藤相关碳纳米管中 SU(4) 对称性的破缺
DOI：
10.1103/physrevb.91.155435
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发表时间：
2013
影响因子：
3.7
通讯作者：
C. Strunk
中科院分区：
文献类型：
--
作者：
D. Schmid;S. Smirnov;M. Marganska;A. Dirnaichner;P. Stiller;M. Grifoni;A. Hüttel;C. Strunk
了解多体现象和纠缠自旋和轨道自由度系统中的非平衡之间的相互作用是纳米电子学的一个中心目标。我们证明了库仑相互作用，自旋轨道耦合，和谷混合的组合结果在一个特定的选择的非弹性虚拟过程中的近藤共振在碳纳米管在低温下。这种效应是由下面的碳纳米管光谱在零磁场和有限磁场下的共轭性质决定的。我们的测量上一个干净的碳纳米管的补充计算的基础上的场理论Keldysh方法的非平衡近藤问题，很好地再现了丰富的实验观察近藤运输。
Understanding the interplay between many-body phenomena and nonequilibrium in systems with entangled spin and orbital degrees of freedom is a central objective in nanoelectronics. We demonstrate that the combination of Coulomb interaction, spin-orbit coupling, and valley mixing results in a particular selection of the inelastic virtual processes contributing to the Kondo resonance in carbon nanotubes at low temperatures. This effect is dictated by conjugation properties of the underlying carbon nanotube spectrum at zero and finite magnetic field. Our measurements on a clean carbon nanotube are complemented by calculations based on a field-theoretical Keldysh approach to the nonequilibrium Kondo problem which well reproduces the rich experimental observations in Kondo transport.